13=r+109/21

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Solution for 13=r+109/21 equation: 


r in (-oo:+oo)

13 = r+109/21 // - r+109/21

13-r-(109/21) = 0

13-r-109/21 = 0

164/21-r = 0 // - 164/21

-r = -164/21 // * -1

r = 164/21

r = 164/21

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